Sometimes you try to add a name to the search bar but it doesn't let you enter anything, I have to flick the switch back to the old Outlook to overcome this. Other times I able to key information in this field with no problems.
Jérémie Lessard commented
I do agree that the search bar is crapy.
When your search for a precise contact, it only search «from who» but not the «to who». and if you do the advanced search and put that contact's name the «who» and «to», it doesn't work.